6503791421 has 4 divisors (see below), whose sum is σ = 6504295200. Its totient is φ = 6503287644.

The previous prime is 6503791403. The next prime is 6503791423. The reversal of 6503791421 is 1241973056.

6503791421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6503791421 - 2¹⁴ = 6503775037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6503791423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232001 + ... + 258518.

It is an arithmetic number, because the mean of its divisors is an integer number (1626073800).

Almost surely, 2^6503791421 is an apocalyptic number.

It is an amenable number.

6503791421 is a deficient number, since it is larger than the sum of its proper divisors (503779).

6503791421 is a wasteful number, since it uses less digits than its factorization.

6503791421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503778.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 6503791421 is about 80646.0874500431. The cubic root of 6503791421 is about 1866.6183673975.

The spelling of 6503791421 in words is "six billion, five hundred three million, seven hundred ninety-one thousand, four hundred twenty-one".